Means for cooling cylinders of explosive-engines.



No. 758,373. PATENTED APR. 26, 1964.

F. H. MARSH & 0. w. NICHOLS.

MEANS FOR COOLING GYLINDBRS'OF EXPLOSIVE ENGINES:

. APPLICATION FILED JULY 5, 1900.

N0 MODEL.

WITNESSES. INVEN 0 5.: I 9.

A HORNE) UNITED} STATES Patented April 96, 1904.

-* PAT ENT OFFICE.

FRANK H. MARSH, OF NEWARK, AND CHARLES w. NICHOLS, or RAHWAY, Y NEW JERSEY.

MEANS FOR oooLme. CYLINDERS OF EXPLOSIVE-ENGINES."

SPECIFICATION forming part of Letters Patent No. 758,373, dated April 26, 1904. Application filed July 5, 1900. Serial No. 22,488. (No model.)

To an whmn it may concern:

Be it known that we, FRANK H. MARSH, residing at Newark, and CHARLES W. NICHOLS, residing at Rah way, in the State of New Jersey, both citizens of the United States, have invented new and useful Improvements in Meahs for Cooling Cylinders of Explosive-Engines, of

: which the following is a specification.

tion of an integral cylinder composed of two metals having difierent qualities, the interior portion thereof being an iron or steel casting, as is usual, to withstand the pressure, strain, and wear and tear, while the outer portion or cover is of bronze or other copper alloy possessing the quality of good heat conductivity and such outer cover being in the form of radial annulior disks. This bimetal cylinder is rendered integral by utilizing one portion thereof as a core in molding and castingthe other portion thereabout. The interior cylinder may also be provided with transverse apertures through its Wall, whereby in molding and casting the outer cover about the cylinder flush studs or plugs of good conductive metal will be formed within such apertures during-the molding and casting process, such studs or plugs serving the purpose of bringing the metal possessing higher conductivity than the cylinder-casting into intimate relation to the products of combustion within the said cylinder, thus increasing the capacity of theheat-radiating jacket. 7

in the drawings accompanying this application Figure 1 is a side elevation of an explosion-cylinder bearing our improvements, and Fig. 2 is a longitudinal section thereof.

In said figures-the letter A indicates the working or inner cylinder portion, and B the outer cylinder portion of metal having higher conductivity than said cylinder in the form of external radial disks or annuli B. The inner cylinder portion A is provided with apertures a through its wall, and plugs or studs 6, composed of the material of outer cylinder portion B, fill the said apertures a. .The cylinder-head is likewise composed of the inner portion C, of cast iron or steel, while its outer A portion D is of a more conductive metal and is provided with extending flanges d. The inner portion C may or may not be provided with apertures and studs, as'in the cylinder. E indicates the usual inlet for the gases, F the exhaust, and G thesparli'er. In the manufacture of our improved cylinder we first cast the inner or working portion A, which is of iron or steel, in the usual manner, preferably forming therein the apertures a, and We subsequently utilize the same as a core, about which is poured molten metal of good conductivity, such as bronze or other suitable alloy, shaping the same substantially as in the drawings-that is to say,.as a covering-shell having the radial disks or annuli B, also producing the cylinder-head in the same manner, or, inversely, we may produce the radial cover first and mold and cast the working cylinder therein. deem it advisable to mold the radial cover about the cylinder, because the former in its shrinkage when cooling will thereby become more closely united upon the latter. It is our purpose in this method of construction to produce a bipart cylinder having the dual characteristics of rigidity and heat conductivity.

Merely fitting together inner and outer shells of different metals does not bring the members into such intimate relation as to permit the complete absorption of heat units from one by the other; but our experiments have proven that the integral formation of a bimetal cylinder in the manner herein de scribed produces perfect cohesion and homogeneity of structure and sets up direct heat radiation from the'working cylinder through its outer cover a d radial disks.

The studs or p ugs I), by the nature of their composition of an alloy suitable as a good We, however,

conductor of heat, serve from their location interspersed about the cylinder interior to provide an antifriction-surface therefor. herefore in selecting the alloy of which to form our outer cylinder portion having the radial disks and inwardly-extending studs or plugs we prefer to employ such composition as is possessed of the best qualifications to answer the three requisitions of heat conductivity, aifinity for gases, and antifrictional contact.

While the use of the plugs 6 extending into the cylinder-casting have the functions as above stated, primarily they are designed to increase the efficiency of cylinders for explosiveengines by providing means which quickly absorb and radiate the heat generated by each explosion therein. To accomplish this, a more intimate relation of the conductive jacket with the products of combustion is desirable and essential than is provided by merely external radiating disks or flanges. The said plugs assure the desired conditions without afl'ecting the wearing quality or durability of the cylinder proper. I,

Havi-ngnow described our invention, we declare that What we claim is 1. In means for cooling cylinders of expl0 sive-engines the combination with a cylindercasting having apertures extending therethrough, of a plurality of ribs exterior to said cylinderand plugs seated in said apertures and in communication with said ribs, said ribs and said plugs being of-higher conductivity than said cylinder-casting, substantially as described.

2. In means for cooling cylinders of explosive-engines, the combination with a cylindercasting having apertures extending therethrough, of a plurality of circumferential ribs exterior to said cylinder and antifrictionplugs integral therewith seated in said aper witnesses.

FRANK H. MARSH. CHARLES W. NICHOLS. Witnesses:

NAT. B. CHADsEY, JACOB FREUND. 

